PMS(4)                  NetBSD Kernel Interfaces Manual                 PMS(4)

     pms -- PS/2 auxiliary port mouse driver

     pckbc* at isa?
     pms* at pckbc?
     wsmouse* at pms?

     options PMS_ALPS_TOUCHPAD

     The pms driver provides an interface to PS/2 auxiliary port mice within
     the wscons(4) framework.  Parent device in terms of the autoconfiguration
     framework is pckbc(4), the PC keyboard controller.  ``pms'' is a generic
     driver which supports mice using common variants of the PS/2 protocol,
     including wheel mice of the ``IntelliMouse'' breed.  Wheel movements are
     mapped to a third (z-) axis.  The driver is believed to work with both
     3-button and 5-button mice with scroll wheels.  Mice which use other pro-
     tocol extensions are not currently supported, but might be if protocol
     documentation could be found.  Mouse related data are accessed by
     wsmouse(4) devices.

     The pms driver has been updated to attempt to renegotiate mouse protocol
     after seeing suspicious or defective mouse protocol packets, or unusual
     delays in the middle of a packet; this should improve the chances that a
     mouse will recover after being switched away or reset (for instance, by a
     console switch).

     The PMS_DISABLE_POWERHOOK kernel option disables PS/2 reset on resume.

     In addition, the pms driver supports the ``Synaptics'', ``Elantech'' and
     ``ALPS'' touchpads in native mode, enabled with the
     nel options.  This allows the driver to take advantage of extra features
     available on Synaptics, Elantech and ALPS Touchpads.

     The following sysctl(8) variables control behavior of Synaptics touch-

               If the touchpad reports the existence of Up/Down buttons, this
               value determines if they should be reported as button 4 and 5
               events or if they should be used to emulate some other event.
               When set to 0, report Up/Down events as buttons 4 and 5.  When
               set to 1, the Up and Down buttons are both mapped to the middle
               button.  When set to 2 (default), the Up and Down buttons are
               used for Z-axis emulation, which more closely resembles how
               mouse wheels operate.

               When the Up/Down buttons are used for Z-axis emulation, this
               value specifies the emulated delta-Z value per click.

               Gestures will not be recognised if the finger moves by more
               than this amount between taps.

               Gestures will not be recognised if the number of packets (at 80
               packets per second) between taps exceeds this value.




               These values define a border around the touchpad which will be
               used for edge motion emulation during a drag gesture.  If a
               drag gesture is in progress and the finger moves into this bor-
               der, the driver will behave as if the finger continues to move
               in the same direction beyond the edge of the touchpad.

               This specifies the pointer speed when edge motion is in effect.

               The driver will ignore new finger events until the reported
               pressure exceeds this value.

               The driver will assume a finger remains on the touchpad until
               the reported pressure drops below this value.

               More recent touchpads can report the presence of more than one
               finger on the pad.  This value determines how such events are
               used.  If set to 0 (default), two-finger events are ignored.
               If set to 1, two-finger events generate a right button click.
               If set to 2, two-finger events generate a middle button click.



               Scale factor used to divide movement deltas derived from Synap-
               tics coordinates (0-6143) to yield more reasonable values
               (default 16 for x and y, 1 for z).



               Limits pointer rate of change (after scaling) per reported
               movement event (default 32 for x and y, 2 for z).

               Movements of less than this value (in Synaptics coordinates)
               are ignored (default 4).

               Sets the top edge of the button emulation region on a clickpad.
               Since a clickpad only reports left clicks this region is used
               to emulate two or three buttons by detecting the finger loca-
               tion and reporting either a button 2 or button 3 click iff the
               click occurs within the region bounded by button_boundary and
               the bottom of the clickpad.

               This defines the left hand edge of the button 3 region.  If a
               click occurs in the region bounded by button_boundary, but-
               ton3_edge and the right hand edge of the click pad then the
               click will be reported as a button3 event.  Button 3 emulation
               can be disabled by setting button3_edge to the right hand edge
               of the clickpad.

               This defines the left hand edge of the button 2 region.  The
               button 2 region is bounded by button2_edge, button3_edge and
               button_boundary.  If a click occurs in this region then it will
               be reported as a button2 event.  For completeness, the region
               between the left hand side of the clickpad, button2_edge and
               button_boundary will be reported as a button1 event as will any
               clicks that occur outside the button emulation region.

               The minimum finger width at which the driver will start report-
               ing vertical movements as Z axis events.  Effectively, this
               emulates a mouse scroll wheel by the user using two fingers
               together on the click pad.  The default value is 5, this value
               cannot be less than 5 due to the way the clickpad reports fin-
               ger width.

               The maximum finger width at which the driver will report finger
               movement as Z axis events.  The default value is 12 and cannot
               be greater than 14.

               This defines the number of packets to continue with the Z axis
               emulation.  Due to the nature of the clickpad maintaining con-
               stant contact can be difficult.  This hysteresis value prevents
               the driver flipping between two finger scroll and normal mouse
               movement erratically.  Each time a valid finger scroll width is
               detected the packet count is reset.  If this variable is set
               too high then mouse movements will be interpreted as Z-axis
               events after the two finger scoll has finished.  If the vari-
               able is set too low then there will be mouse movements observed
               during the two finger scroll.

     The following sysctl(8) variables control behavior of Elantech touchpads:


               Increased values improve the accuracy of X, Y, and Z-axis
               reporting at the expense of slower mouse movement (default 2
               for xy, and 3 for z).

     For Elantech touchpads, the Z-axis is emulated using two-finger Y-axis

     The following sysctl(8) variables control behavior of ALPS touchpads:


               Decreased values improve the accuracy of X and Y-axis reporting
               at the expense of slower mouse movement (default 2 for touchpad
               and 1 for TrackStick).

     pckbc(4), ums(4), wsmouse(4)

     The pms driver was originally written by Christopher G. Demetriou.  The
     changes to merge the ``IntelliMouse'' protocol in, and reset the mouse in
     the event of protocol problems, were contributed by Peter Seebach.  Spe-
     cial thanks to Ray Trent, at Synaptics, who contributed valuable insight
     into how to identify bogus mouse data.  The changes to add ``Synaptics''
     pad support were by Ales Krenek, Kentaro A. Kurahone, and Steve C.
     Woodford.  The changes to add ``Elantech'' pad support were by Jared D.

     It is possible for the driver to mistakenly negotiate the non-scroll-
     wheel protocol, after which it is unlikely to recover until the device is
     closed and reopened.

     The ``Elantech'' pad code only supports trackpads with firmware version
     2.48 or above.

NetBSD 8.0                     February 4, 2018                     NetBSD 8.0

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